llvm-6502/test/CodeGen/X86/shrink-fp-const1.ll

; RUN: llvm-as < %s | llc -march=x86-64 -mattr=+sse2 | not grep cvtss2sd
; PR1264

define double @foo(double %x) {
        %y = mul double %x, 5.000000e-01
        ret double %y
}
Add a target lowering hook to control whether it's worthwhile to compress fp constant. For x86, if sse2 is available, it's not a good idea since cvtss2sd is slower than a movsd load and it prevents load folding. On x87, it's important to shrink fp constant since fldt is very expensive. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47931 91177308-0d34-0410-b5e6-96231b3b80d8 2008-03-05 01:30:59 +00:00			`; RUN: llvm-as < %s \| llc -march=x86-64 -mattr=+sse2 \| not grep cvtss2sd`
			`; PR1264`

			`define double @foo(double %x) {`
			`%y = mul double %x, 5.000000e-01`
			`ret double %y`
			`}`